Bacterial wilt does not occur every year in Minnesota.It cannot overwinter in Minnesota in plant debris. The bacteria cannot transmit in seed, does not survive in soil, and only survives in plant debris for a short period. Once bacterial wilt infects a plant, there is no way to control the disease. The bacteria multiply rapidly within the plant and plug the vascular tissue, resulting in wilting of the vines.The bacteria are on the mouthparts or in the fecal matter of the beetle and enter the plant through the feeding wounds. They then move to new plants, creating wounds through feeding. Beetles that feed on infected plants pick up the bacteria. The bacteria overwinter in the gut of striped and spotted cucumber beetles.Bacterial wilt does not affect watermelon. It does not affect squash and pumpkins as much. This pathogen can cause severe losses in cucumbers and muskmelons. The bacterium Erwinia tracheiphila causes bacterial wilt.Striped cucumber beetle feeding and feces spread bacterial wilt. However, if you do not see them, you may still have bacterial wilt. If you see the thread-like strands, you can assume that you are seeing bacterial wilt. This method is not always effective because the threads can be hard to see without a microscope. Authors: Amanda Gevens, UW-Madison Plant Pathology with contributions by UW-Madison Plant Pathology undergraduates Ken Cleveland and Lauren Thomas Last Revised. If infected vines are cut close to the crown of the plant and the cross-sections pressed together, thread-like strands of bacterial ooze are visible when the two halves are gently pulled apart again. ![]() Striped or spotted cucumber beetles will be present in the garden. ![]() ![]()
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